Solid Carbide EndMill A up to HRC 60 H650 Series ■ For hardened steel, HRC 40~60. ■ Ultra grain carbide. ■ SICO, TOP ARCO coating. A01~A30 up to HRC 55 G550 Series ■ For ordinary steel, alloy steel, cast iron, HRC 30~55. ■ Micro grain carbide. ■ UNICO coating. A31~A70 up to HRC 50 M500 Series ■ For stainless steel, diffi cult-to-cut material, HRC 20~50. ■ Ultra grain carbide. ■ ARCO coating. A71~A80 up to HRC 48 G450 Series ■ For steel, alloy steel, cast iron, aluminum alloy (Si > 15%), HRC 20~48. ■ Micro grain carbide. ■ UNICO coating. A81~A86 up to HRC 18 A100 Series ■ For non-ferrous, aluminum, aluminum alloy, copper, HRC < 18. ■ Micro grain carbide. ■ Uncoating. A87~A94